Hello Systemd developers!
> I asked this question earlier but I haven’t gotten any reply so I thought
> asking again.
> Question regarding sd_bus_add_match (sd-bus.c):
>
> Is there any bad consequences to use the same callback for multiple signal
> match and then using the userdata parameter to distinguish among the
> different signals? See the sample code below for a reference of what I am
> trying to do.
>
> /*Beginning=========================================*/
> int callback(sd_bus_message *message, void *userdata, sd_bus_error *error) {
> //there should be a lock applied here?
> if(get_signal_id(userdata) == 1) {
> //do something
> }
> }
>
> int main(...) {
> r = sd_bus_add_match(bus, &slot, "type='signal'", test_callback, userdata);
> int r;
> sd_bus *bus = NULL;
> sd_event *event = NULL;
> sd_bus_slot *slot = NULL;
>
> r = sd_bus_default_system(&bus);
> assert(r >= 0);
>
> r = sd_event_default(&event);
> assert(r >= 0);
>
> void *userdata1 = set_signal_id(1);
> r = sd_bus_add_match(bus, &slot,
> "type='signal',interface='org.interface2'", callback, userdata1);
>
> void *userdata2 = set_signal_id(2);
> r = sd_bus_add_match(bus, &slot,
> "type='signal',interface='org.interface1'", callback, userdata2);
>
> r = sd_event_loop(event);
> assert(r >= 0);
>
> bus = sd_bus_flush_close_unref(bus);
> slot = sd_bus_slot_unref(slot);
> event = sd_event_unref(event);
> }
>
> /*End =========================================*/
>
> I appreciate your help and your time.
>
> Thank you,
> David J (ema...@icloud.com)
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